Sidney



llNiTEn STATES PATENT OFFICE SIDNEY o. MAHANAY AND BEN. L. CAMPBELL, onNEAR MANCHESTER, Mo.

ELECTRIC'RAILWAY-SIGNAL.

SPECIFICATION forming part of Letters Patent No. 352,700. dated November16, 1886.

being had to the accompanying drawing, and

' to the letters and figures of reference marked thereon, which form apart of this specification.

The figure of the drawing represents a plan view of the invention. I

This invention relates to an improved electric alarm to be placed at arailroad-crossing; and it consists in the devrcvfifeih'aftefset forth.

In the annexed drawing, the letter A indicates a portion of arailroad-track at an ordinary crossing. On oneside orline of rails arethree sections, a b 0, insulated from one an other and the rest of therails. On the opposite section, parallel with these three sections, isanother section, d, coextensive with the three sections a b 0, and inlike manner insulated from the rest of the track. At a convenientdistance from the track are placed an alarm, B, and relay 0, and batteryD. A wire, E, connects the battery-with the track-section d. Runningfrom the batteryD to the alarm 13 is a wire, I). This wire b isconnected also by another, b with the binding-post o of the relay, fromwhich post the wire 0 connects with relay-coils, and another wire, 0passes thence to the other bindingpost, 0. A wire, b connects this post0 with the middle track-section, b, and another wire, 0 connects saidpost a with the armature front stop, f. The back stop, f, is connectedwith the alarm by a wire, f tions at and c are connected by abridge-wire, at, around the section b, and from this bridgewire runsanother wire, of, connecting with the wheel of the armature F, thelatter nor mally resting against the back stop, f, and thereforenormally open. This produces five metallic circuits. One includes themiddle section,- b, and section d, passing through the p The two secApplication filed April 14, 1886. Serial No. 198,825. (No model.)

other four consist of two sets of two circuits each, one set includingsections a and d, the other set sections 0 and 01, each set including analarm-circuit which has the relay-armature as part thereof, and anothercircuit which includes the relay-coils and the relay-armature. Thealarm-circuit is open at the track only, and the other at the trackandthe armature.

a As a train approaches in the direction of the arrow 1, as soon as thefront wheels touch the sections d and a the alarm-circuit is closedthrough the engine, section d, wire E, battery D,wire b, alarm B,wire fbackstop f, armature F, wire a bridge-wire a", and section a, and thealarm is sounded. This circuit continues closed until the front wheelsreach the section b, when the shorter circuit through sec- ,circuit, andthe alarm ceases. As the train passes onto section a, the circuit fromsection b continues closed until the whole train leaves such section b.At thevery instant this takes place, the armature F being closed, acircuit is formed throughthe train, section cl,wire E, batteryD,wires 1) c relay-coils, wires 0 0 front stop, f, armature F, wires a aand section 0. I and prevents the alarm-circuit being closed through thetrack-section c, which would hap-- pen were the armature allowed to fallopen. As soon as the train leaves the section 0, the armature fallsopen, and, resting against the back stop, the alarm-circuit is ready foranother train. Should a train approach in the direction of arrow 2, thesame action would ensue. The alarm-circuit would be closed throughsections (2 and 0. wires a a", and .E, and the This still holds thearmature closed,

other parts, as already described, then the rewhen the train approachesthe crossing, the other circuit being to keep the alarm-circuit brokenas the train passes the section in leaving the crossing.

Having described our invention, What we claim is 1. The combination ofthe sections a b c of one line of track-rails and the section d of theother line of track-rails, sections 2) and 01 being parts of are1ay-circuit, which circuit is normally open, the armature resting onthe back stop, and sections a and d and c and (1 being, each set, partsof an alarm-circuit which includes the relay-armature, and each set alsoparts of another circuit which includes the relay-coils andrelay-armature, as set forth.

2. The combination of the sections a, b, c,

in presence of two witnesses.

SIDNEY O. MAHANAY. BEN. L. CAMPBELL.

Witnesses:

W. J. HOLLOOHER, FRANK J. HOFSTETTER.

Correction in Letters Patent No. 352,700.

It is hereby certified that in Letters Patent No. 352,700, grantedNovember 16, 1886, upon the application of Sidney O. Mahanay and Ben. L.Campbell, of near Manchester,

Missouri, for an improvement in Electric Railway-Signals, an errorappears in the printed specification requiring the following correction:In line 48, page 1, the Word Wheel should read heel and that saidLetters Patent should be read with this correction therein that thesame'may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 23d day of November, A. D. 1886.

[SEAL-.1 D. L. HAWKINS,

Acting Secretary of the Interior. Gountersigned:

R. B. VANCE,

Acting Commissioner of Patents.

